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RI35 Unconformities in the Fluvial Columbia Sediments Revealed by Thin Pebble Beds

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RI35 Unconformities in the Fluvial Columbia Sediments Revealed by Thin Pebble Beds
Publication Type:
Report of Investigation
Publication Date:
May 1982
Authors:
Spoljaric, N.
Abstract:

An explanation is suggested for the origin of thin, laterally persistent pebble beds commonly found in the Columbia Formation of Delaware. The pebbles in the thin beds are usually less than 16 mm in diameter, well rounded, spherical, and composed mainly of resistant material: chert, vein quartz, and quartzite. The process thought to be responsible for the origin of these beds is a combination of erosion and transport of sand and pebbles in suspension by highly turbulent streams resulting in selective deposition of pebbles in thin, laterally persistent layers. An attempt is made to estimate quantitatively the amount of sand that has to be eroded to produce thin pebble beds. The results suggest that such pebble beds mark significant erosional unconformities within the fluvial Columbia sequence.

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Please give proper credit to the Delaware Geological Survey.

Spoljaric, N., 1982, Unconformities in the Fluvial Columbia Sediments Revealed by Thin Pebble Beds: Delaware Geological Survey Report of Investigation 35

Contact Info

Delaware Geological Survey
Phone: (302)-831-2833
Fax: (302)-831-3579
delgeosurvey@udel.edu

University of Delaware
Delaware Geological Survey Building
Newark, DE 19716
Mon - Fri; 8:00am to 4:30pm



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